I did a 5.3 motor and the 4L60E trans from a 2008 Silverado. A lot of time and headaches were involved. Plus the money headache. Was it worth it? Hell yeah! It's a beast on the trails and tons of fun to drive on the streets.

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Horsepower is like a hot girl with STDs. You know you want to hit it but you're afraid of the consequences.

You won't need to swap your trannyfor most swaps. Dozens of great build threads and tons of links to knowledge bases. Figure out your budget, do some research, and figure out which option is best for what you want your jeep to do. You'll get the most out of this forum from asking more specific questions once you narrow it down to a couple different motor options. They all involve work, some less than others.

You won't need to swap your trannyfor most swaps. Dozens of great build threads and tons of links to knowledge bases. Figure out your budget, do some research, and figure out which option is best for what you want your jeep to do. You'll get the most out of this forum from asking more specific questions once you narrow it down to a couple different motor options. They all involve work, some less than others.

An AX5 or T990 (I think that's what the auto transmissions are) in a car with more than 150 tq?

I don't think that'll work out well. If it was an AX-15, then yeah. AX-5? Not so much.

Well going to a v8 was my first idea but I heard that it would be cheaper ad still good power if I went with v6 and that I wouldn't have to change everything if I went with the 6 compared to the v8

If you go the V6 route you will still need to change the trans. The Ax5 will not cut it even behind the Chevy 4.3 V6. You can get an adapter the adapt the GM trans to the 231 tcase. As said above your weak link will be your D35.

There is a lot to it. For some it can be an easy and inexpensive swap and others difficult and expensive.

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Horsepower is like a hot girl with STDs. You know you want to hit it but you're afraid of the consequences.

Alright so what I'm seeing here is I'm getting different answer, so it can depend on rather or not by the motor I get if I'll need to get a new transmission or just an adapter, and I was planning on gettin lock in differential anyways. So what would Yal say would be the best motor to get if I went with a v6 and if I went with the v8 whats my best option there

If you do a V6 the Chevy 4.3, V8 my preference would be the LS series of Chevy motors. They are easy to find and have huge aftermarket support. The most common is the 5.3 but you can do the 4.8 or if you want the 6.0.

You are going to need more than just "lock in differenital". You need to replace the rear Dana 35 if you plan on going to a bigger motor. If you have the AX15 you can get an adapter to mate it to the motor. Just remember you will be increasing horsepower and torque. With the power my 5.3 puts out I wouldn't want the AX15 behind it.

__________________
Horsepower is like a hot girl with STDs. You know you want to hit it but you're afraid of the consequences.

I had the 2.5 with the AX-5 and Turdy 5 like you. I blew up the spiders in the 35 and swapped it out with a 8.8 out of a 97 Exploder and got a Posi and disk brakes out of it. Fairly easy straight forward swap and no major issues. Syncros in my AX-5 let go about 7 months later so I found an AX-15 for it. While looking for swap parts and adapters I found a guy selling a complete 98 4.3 with a new clutch, wiring harness and computer. New tranny had a TC on it with a SYE and the guy gave me a spare XJ front shaft with it as well. Got my local machine shop to shorten the XJ shaft and used it for my rear and was able to reuse the front one. As for the swap itself, it went smoothly with parts from Advanced Adapters. I got the computer re-flashed from a local company to get rid of the VATS and auto tranny and TC controls along with the after cat O2 sensor. You don't need to change the radiator with the 4.3 but have to get creative with the hoses. I've made a 3 hour drive on the highway with it and a couple of off road runs and no issues at all with overheating.
Performance wise it's awesome. I can run in 5th on the highway at about 2500 RPM and don't have to downshift for hills and can even accelerate and pass while still in 5th with the 31's I don't expect much difference with my 33's as I have roughly half the pedal left at 65mph. Had a few minor hiccups along the way but the swap was well worth it. Roughly a 100hp gain over the stock 2.5L 4 banger.

__________________l We're here for a good time. Not a long time. So have a good time the sun can't shine every day. l_______
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Alright so what I'm seeing here is I'm getting different answer, so it can depend on rather or not by the motor I get if I'll need to get a new transmission or just an adapter, and I was planning on gettin lock in differential anyways. So what would Yal say would be the best motor to get if I went with a v6 and if I went with the v8 whats my best option there

Listen man you really need to decide what you want out of it besides just something easy, because even the easy ones require pulling the whole engine out and replacing it. You'll continue to get different answers on here because everyone has different needs, different preferences, and different experiences. I can't stress enough that you need to check out somewhere like novak (http://www.novak-adapt.com/) and get some more specific info. This is a huge topic and you're keeping it too broad so everyone is going to keep repeating the same thing. You're not going to get one clear answer to this question in a thread like this, its too big a question. After you check out novak and narrow it down, search the yj technical section for build threads using the different motors you narrow it down to, find out what their experiences were like, decide, and dive in. Once you're a little further along the people on here will be able to talk you through any troubles you run into, absolutely.